Not always the plant in focus - Saxifraga cespitosa

[Hoy]

I was looking for plants when I came upon a school of butterflies (Can you say "...school of butterflies"?). It was the common "blåvinge" ("blue-wing" (Polyommatus icarus) as we call it here) and some of them sat here by the saxifrage, to rest?

Edit correction: Fjellblåvinge (Albulina orbitulus)

[Todd Boland]

We have spring and summer azure butterflies which are very similar but I have never seen them in a group like yours!  Great photo!

[Lori S.]

Here, the city is very poor for butterflies and moths, but the nearby mountains are much, much better.  We often see small gatherings of similar looking blue butterflies (I'm not up on Lepidoptera IDs) in the mountains - sadly, my photographic abilities aren't up to getting good pictures, like yours!  Sometimes, we see them dancing around over and apparently feeding on charcoal from old bonfires, horse dung, and damp spots along the trail - getting some kind of nutrients or minerals, I suppose.

[Hoy]

Here, the city is very poor for butterflies and moths, but the nearby mountains are much, much better.  We often see small gatherings of similar looking blue butterflies (I'm not up on Lepidoptera IDs) in the mountains - sadly, my photographic abilities aren't up to getting good pictures, like yours!  Sometimes, we see them dancing around over and apparently feeding on charcoal from old bonfires, horse dung, and damp spots along the trail - getting some kind of nutrients or minerals, I suppose.

.....getting good pictures! My camera and I do not always agree about what to focus on. This was just good luck!
What do you call a gathering of butterflies? A school of, a hoard of, a herd of or what?  - I think they licked mineral water here.

[Booker]

Here, the city is very poor for butterflies and moths, but the nearby mountains are much, much better.  We often see small gatherings of similar looking blue butterflies (I'm not up on Lepidoptera IDs) in the mountains - sadly, my photographic abilities aren't up to getting good pictures, like yours!  Sometimes, we see them dancing around over and apparently feeding on charcoal from old bonfires, horse dung, and damp spots along the trail - getting some kind of nutrients or minerals, I suppose.

What do you call a gathering of butterflies? A school of, a hoard of, a herd of or what?  - I think they licked mineral water here.

A flutter?   

[Lori S.]

What do you call a gathering of butterflies?

A flutter?  

Well, yes, apparently that is one of the terms!  Most fitting!
http://en.wikipedia.org/wiki/List_of_animal_names
I don't know about "a rabble" though... I'd be more inclined to apply that to house sparrows or starlings here!